0.5mm for the front suspension arms would only be printable in Frosted Ultra Detail and then there's the probability that the model would not survive intact due to the mass that the thin parts need to support.

0.7mm is the minimum for Strong & Flexible - even 1mm 'wire' is very flexible, for ridigity and printability in all but Ceramic, I'd be thinking somewhere up around the 1.5mm mark for the suspension wires and 1mm for the wings and rear under tray parts.